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n in (-oo:+oo)
4*n-(1/7) = 5/7 // - 5/7
4*n-(1/7)-(5/7) = 0
4*n-1/7-5/7 = 0
4*n-6/7 = 0 // + 6/7
4*n = 6/7 // : 4
n = 6/7/4
n = 3/14
n = 3/14
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